'I clearly wasn't doing the right things': Melissa Doyle talks lifestyle overhaul that led to weight loss after leaving Sunrise - and how at 44 she's happier than ever

She was a popular breakfast television host for 11 years on Sunrise, but the success came with a cost for Melissa Doyle.

The Channel 7 personality, who last year swapped the early bird shift to anchor the station's 4pm bulletin, has opened up about the toll more than a decade in morning television took on health.

'It was gruelling. I’ll be really honest about that,' Doyle told MailOnline at the launch of National Prevention Week, held by Prevention magazine in Sydney on Tuesday.

Lifestyle overhaul: Channel 7 TV host Melissa Doyle showed off her recent weight loss in a figure-hugging purple dress at the National Prevention Week launch in Sydney on Tuesday

'It was like having jet lag all the time,' was how the mother of two described her three am wake up from Monday to Friday.

The glamorous blonde, who recently told WHO magazine she ‘dropped a couple of dress sizes’ since leaving Sunrise, said her recent weight loss is thanks to drastically overhauling her lifestyle at 44.

‘I’ve started getting up twice a week in the morning and doing weights at the gym. Who knew?’ the bubbly star laughed. ‘I found this really cute 23-year-old-trainer, so that’s helped as well,’ she joked.

All dressed up! Channel 7 star Sally Obermeder looked fantastic in a figure-hugging black dress at the breakfast event at the Museum of Contemporary Art in Sydney

If she’s not at the gym, Doyle runs on her treadmill at home.

‘I’ve just started [HBO television show] Game of Thrones and I’ve promised myself I can’t watch it unless I’m on the treadmill so I actually want to get up and get on the treadmill,’ she laughed.

Doyle’s fellow Channel 7 host Sally Obermeder also shared her personal story at the event, which kicked off the national week-long initiative designed to increase awareness of preventative health.

Good cause: Melissa and Prevention magazine editor Jacqui Mooney at the launch of the annual week-long event, that aims to raise awareness of preventative health

In 2011 at 37-years-old, Obermeder received the shocking diagnosis that she had stage-three breast cancer - and she was 41 weeks pregnant.

'I was days away from giving birth,’ the 40-year-old recalled. 'The doctors said it was aggressive and the prognosis was bad. No one wants to hear "I don’t think she’ll make it" as you’re about to give birth, but the doctors were very much saying ‘We’ll see what happens’.

After getting the all-clear in 2012, the stunning presenter said she has gained a new perspective on life.

‘If you have your health and you have people around you that you love, then life is pretty perfect,’ she mused.

‘I say "no" to a lot of things so that I really enjoy the things I do.